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I 1 UNITED STATES PATENT OFFICE,

HEINRICH OSTERMANN AND AXEL PBIP, OF GENEVA, SWITZERLAND.

ALLOY.

I SPECIFICATION forming part of Letters Patent N 0. 382,826, dated May 15, 18 88. '1

Application filed February 16,1888.

To all whom itm/uv/y concern.-

Be it known thatv we, HEINRICH OsTE MANN, chemist, and AXEL PRIP, jeweler,both residing at Geneva, Switzerland, have invented 5 a Metallic Alloy, of which the following is a specification. p

Our invention relates to a non-magnetic metallic alloy to replace steel in the works of watches, and is especially intended for the different parts of watch-escapements, Kn al: loy for said purpose should be ductile'and malleable. Its hardness and its coeff cient of linear expansion must be as nearly as possible the same as that of steel,

Our alloy possesses the properties before mentioned, and it is composed of the metals and in the proportions next set forth, viz; platinum, fifty to sixty parts; copper, ten to twenty parts; nickel, twentyto thirty parts;

Serial No. 264.249. (No specimens.)

wolfram, one to two parts; cobalt, one to two 20 parts, and cadmium one to one and one-half part.

Having thus describedour invention, what 7 we claim is- An alloy composed of platinum,. fiftyto 25 I sixty parts; copper, ten to twenty parts; nickel, twenty to thirty parts; wol fram, one to two 1 parts; cobalt, one to two parts, and cadmium one to one and one-half part, substantiallyas described, and for the purpose specified. 0 In testimony whereof we have signed our names to this specification in the presence of twosubscribing witnesses.

' HEINRICH OSTERMANN.

vAX'E L PRIP. Witnesses: v LKTIADAMSF ELMER SCHNEIDER. 

